Notes and Homework for Electric Charges and Electric Field
Make sure to read pg. 433-453
Name______________________________________________________________
1. _______________________________________ forces between atoms and molecules hold
them together to form __________________ and ______________________________.
2. Many forces (________________________________________________________________________)
are considered to occur due to electric forces
3. ____________________________________ means amber. If an object is rubbed it
_____________________________ pieces of dust. We now call this
__________________________________electricity.
4. If an object becomes changed while rubbing it with a cloth, it possesses a
_____________________________________ charge.
5. Two types of electric charge are ________________________ and ______________________
6. Charged particles ___________________________ like charge particles and
______________________________ the opposite charge
7. Law of ____________________________________________________________________________:
the net amount of electrical charge produced in any process is ________________
8. Protons are ___________________________, electrons are _____________________ and
neutrons are __________________________ particles.
9. Ions are atoms that lose or gain ________________________________
10. ______________________________________ atoms are neutral atoms but charge is not
________________________________ distributed
11. _____________________________________________________of electricity are materials
such as iron that transfer electricity from a charged material to an uncharged
material. Conductors have ______________________________________________________,
that readily move toward a charged object
12. _____________________________________________________are materials such as rubber
that do not transfer electricity. They have _____________________________________
13. Semiconductors are _________________________________________
14. Charging _____________________________________________ is the charging of an object
through ___________________________, changing the ___________ charge of that object
15. Charging by _____________________________________________________ is when charges
are separated in an object due to the proximity of another charged object, but
the _________________________________ does not change
16. An object which is _________________________________________has its conducting
wires connected to the ground and the ground
_______________________________________________________________ easily acting as a
reservoir for the electrons.
17. An __________________________________________ is a device used for detecting charge.
________________________________________ leaves move apart if the object brought
up to the device is charged.
Coulomb’s Law
1. ________________________________________________________ (1736-1836) investigated
electric forces in the 1780’s
2. Concluded that the electric _______________________________ on one charged object
on another charged object is _____________________________________________________
to the charge on each of them
3. Led to Coulomb’s Law which is: ______________________________________________
where _________ is a proportionality constant, the force is the
________________________________________________ of one charged object on another,
___________ is the magnitude of each object and _________ is the distance
between them.
4. The ________________________________of the electric force is always along the line
joining the two charges and depends on if they have the same sign or
different signs
5. The SI unit charge is the ___________________________
6. k = _________________________________________________
7. Coulomb is very large and is the amount of charge you place on two objects,
______________________________, each object would exert a force of 9x109
8. Objects with static electricity are in the
______________________________________________
9. The elementary charge is the smallest charge found in nature and is:
e=_________________________________________
10. Electrons are ______________________________ (existing in discrete amounts)
11. Coulomb’s Law looks very much like the __________________________________________
12. When determining r, if the two objects are _______________________________ we use
the distance between their _______________________
13. Coulomb’s law only works with charges at ___________________________and only
gives the __________________________________________ force.
14. When using Coulomb’s Law we ignore ________________________________________
and use magnitudes only.
15. The electrostatic force is a _____________________, with magnitude and
_____________________________.
16. It is important to draw a ____________________________________ in applying
Coulomb’s Law
17. Add all forces together to obtain the __________________ force of an object.
Now take a look at the Example 16-1 and 16-2, what is the equation used?
What does example 16-2 prove?
Make sure to look through the vector review on pg. 450 and write down anything
that might help you with reviewing vectors:
Read through examples 16-3, how do you apply vectors to help solve a problem of
three charges?
Now, let’s try a few problems. First go to the questions on pg. 467 and answer 3, 6
and 10. Then do the following problems form pg 469: # 2, 8, and 17